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Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | $ 180,315 | $ 191,934
Unrealized Gains | 2 |
Unrealized Losses | (96) | (80)
Estimated Fair Value | 180,221 | 191,854
Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 38,712 | 26,584
Estimated Fair Value | 38,712 | 26,584
Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 141,603 | 165,350
Unrealized Gains | 2 |
Unrealized Losses | (96) | (80)
Estimated Fair Value | 141,509 | 165,270
Cash | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 4,515 | 4,041
Estimated Fair Value | 4,515 | 4,041
Money Market Funds | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 22,697 | 22,543
Estimated Fair Value | 22,697 | 22,543
U.S. Treasuries | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 11,500 |
Estimated Fair Value | 11,500 |
U.S. Treasuries | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 25,694 | 45,559
Unrealized Losses | (18) | (25)
Estimated Fair Value | 25,676 | 45,534
U.S. Government Agency Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 45,329 | 86,860
Unrealized Losses | (70) | (40)
Estimated Fair Value | 45,259 | 86,820
Corporate Debt Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 70,580 | 32,931
Unrealized Gains | 2 |
Unrealized Losses | (8) | (15)
Estimated Fair Value | $ 70,574 | $ 32,916

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